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RYG Rules for Forecast Page

Category

Yellow Red
Personnel
  • Wind chill < -75 F
  • Heat Stress Index (HSI) >=105
  • Severe Thunderstorms (winds > 50kt, frequent lightning, hail > 1/2 inch)
  • Winds > 50kts
Cat 1 Watercraft

Floating Causeway, RRDF, SLWT, Causeway Ferry

  • Sea State >= 2
  • MSI >= 5
  • Visibility < 1 mile
  • Freezing drizzle
  • Winds > 30 kts
  • Sea State >= 3
  • MSI >= 6
  • Visibility < 1/2 mile
  • Freezing rain
  • Winds > 50 kts
Cat 2 Watercraft

LCM, LARC, 65' Tug, 100' Tug

  • Sea State >= 2.5
  • MSI >= 7
  • Visibility < 1 mile
  • Freezing drizzle
  • Winds > 30 kts
  • Sea State >= 3.5
  • MSI >= 8
  • Visibility < 1/2 mile
  • Freezing rain
  • Winds > 50 kts
Cat 3 Watercraft

LCU 2000, LSV, 128' Tug

  • Sea State >= 3
  • MSI >= 10
  • Visibility < 1 mile
  • Freezing drizzle
  • Winds > 30 kts
  • Sea State >= 4
  • MSI >= 12
  • Visibility < 1/2 mile
  • Freezing rain
  • Winds > 50 kts
Vehicle
  • Visibility < 1 mile
  • Heavy Rain
  • Visibility < 1/2 mile
  • Freezing precipitation
  • Snow/Ice accumulation on roads
  • Winds > 50 kts

 

Heat Stress Index (HSI)

HSI, like the Wet Bulb Globe Temperature (WBGT) units use on a daily basis, is an indicator of dangerous heat conditions. Like WBGT, HSI takes into account air temperature and humidity. However, it does not account for 2 parameters that WBGT does--sun shine and the cooling of the wind (parameters we can't currently forecast). HSI should be used as an indicator of potential heat danger so appropriate preparations can be made before a dangerous situation arises (e.g. ensuring extra water is available, adjusting training schedules, etc.). Units should continue to use WBGT observations IAW SOPs to determine water requirements and required duty modifications.

HSI 80 to 89: Fatigue possible with prolonged exposure and physical activity.

HSI 90 to 104: Sunstroke, heat cramps, or heat exhaustion possible with prolonged exposure and physical activity.

HSI 105 to 129: Sunstroke, heat cramps, or heat exhaustion likely; heatstroke possible with prolonged exposure and physical activity.

HSI > 130: Heatstroke or sunstroke imminent.


 Wind Chill: (Info on New Wind Chill)

  Temperature (degrees Fahrenheit)

Calm

40

35 30 25 20 15 10 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45
5

36

31 25 19 13 7 1 -5 -11 -16 -22 -28 -34 -40 -46 -52 -57 -63
10

34

27 21 15 9 3 -4 -10 -16 -22 -28 -35 -41 -47 -53 -59 -66 -72
15

32

25 19 13 6 0 -7 -13 -19 -26 -32 -39 -45 -51 -58 -64 -71 -77
20

30

24 17 11 4 -2 -9 -15 -22 -29 -35 -42 -48 -55 -61 -68 -74 -81
25

29

23 16 9 3 -4 -11 -17 -24 -31 -37 -44 -51 -58 -64 -71 -78 -84
30

28

22 15 8 1 -5 -12 -19 -26 -33 -39 -46 -53 -60 -67 -73 -80 -87
35

28

21 14 7 0 -7 -14 -21 -27 -34 -41 -48 -55 -62 -69 -76 -82 -89
40

27

20 13 6 -1 -8 -15 -22 -29 -36 -43 -50 -57 -64 -71 -78 -84 -91
45

26

19 12 5 -2 -9 -16 -23 -30 -37 -44 -51 -58 -65 -72 -79 -86 -93
50

26

19 12 4 -3 -10 -17 -24 -31 -38 -45 -52 -60 -67 -74 -81 -88 -95
55

25

18 11 4 -3 -11 -18 -25 -32 -39 -46 -54 -61 -68 -75 -82 -89 -97
60

25

17 10 3 -4 -11 -19 -26 -33 -40 -48 -55 -62 -69 -76 -84 -91 -98
Wind Chill Possible Effects
30F> Chilly: Generally unpleasant
15-30F Cold: Unpleasant
0-15F Very Cold: Very unpleasant
-20- 0F Bitter Cold: Frostbite possible.
-20- -60F Extremely Cold: Frostbite likely. Outdoor activity becomes dangerous.
-60< Frigidly Cold: Exposed flesh will freeze within half a minute.

 

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